Perplexing AwStats numbers...

Hi everyone

For a long time, stats were normal. There were no anomalies, erratic behavior, weirdness, etc. Then, about 6 months ago, I began to notice that on every fourth day the number of daily visitors, bandwidth usage, etc would go down drastically. Then, just a few months ago, this began happening every two days. Here, have a look for yourself...

HTML:

Day	Number of visits	Pages	Hits	Bandwidth
01 Nov 2010	3911	397394	603809	1.47 GB
02 Nov 2010	674	80606	105407	211.97 MB
03 Nov 2010	4271	518774	720992	1.59 GB
04 Nov 2010	4683	481842	707594	1.57 GB
05 Nov 2010	599	68553	104020	147.66 MB
06 Nov 2010	3511	380460	525569	1.21 GB
07 Nov 2010	4223	452580	638567	1.34 GB
08 Nov 2010	577	67245	91400	175.08 MB
09 Nov 2010	4197	474739	661421	1.50 GB
10 Nov 2010	4696	470478	675476	1.51 GB
11 Nov 2010	493	46500	62286	120.05 MB
12 Nov 2010	3707	428728	590912	1.30 GB
13 Nov 2010	3674	453810	612846	1.27 GB
14 Nov 2010	424	55659	67546	120.87 MB
15 Nov 2010	4557	383100	566934	1.33 GB
16 Nov 2010	4915	425580	645864	1.44 GB
17 Nov 2010	608	40258	55477	122.76 MB
18 Nov 2010	4158	450205	616440	1.39 GB
19 Nov 2010	4314	414777	580541	1.25 GB

I have never been able to figure out what is going on here. Could it be a bug in AwStats?. The host going off-line every few days?. Perhaps something sinister going on courtesy of a scammer/spammer?.

I'm clueless at the moment and would really appreciate some input on this as I cannot for the life of me figure out what is causing these alternating hi's and lo's.

Thanks so much, JayBird